This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A191173 #4 Mar 30 2012 18:57:30 %S A191173 1,2,3,5,6,10,12,14,17,21,22,26,29,30,41,42,48,50,57,58,65,70,77,86, %T A191173 90,93,106,111,118,122,125,129,149,156,166,170,173,192,194,201,202, %U A191173 209,230,234,237,257,262,264,269,273,282,310,317,346,353,362,365,372,374,381,426,435,446,453,474,490,497,502,509,516 %N A191173 Integers in (-2+A191124)/4; contains A191124 as a proper subsequence. %C A191173 See A191124. %t A191173 (See A191124.) %Y A191173 Cf. A191124, A191172. %K A191173 nonn %O A191173 1,2 %A A191173 _Clark Kimberling_, May 27 2011